couple of red flags greek...we need to fix
eating...maybe twice a day? no good dude, no wonder her metabolism is so slow! she needs to eat small meals, many times a day. 4-5 meals a day balanced out. natural foods, lower carbs...no wheat, fresh steamed vegetables. (fish, chicken, beef....sweet potatoes, brown rice, spinach, broccolli..etc) the less processing, the better. if it came out of a box....it probably aint that good.
walking is ok for regular exercise...but for fat loss she is gonna need to do more intense cardio. have her doing cardio on all four of her gym days as of now. 30-40 minutes, target heart rate at probably around 150-175bpm (someone chime in if im wrong)
weight training....have her do and upper/ lower split. (monday...upper....tuesda y...lower....wednesday off....thursday upper....friday...lower) maybe ease her into it...higher intensity, higher rep weight training with limited rest between sets (15-30 seconds max)